runs good till warm

[dieselboy740]

my 86 bII runs great but as soon as it warms up it starts running way rich. I've tried map, 02, iat, ECM, coolant temp sensors both of them, fpr. This is not a street legal rig so is there a way to keep the computer in closed loop? When it's cold it's the best running 2.9 I've came across. I'm about to megasquirt it so it will run better. I might even turbo it for fun just because I can.

 

[Psychopete]

my 86 bII runs great but as soon as it warms up it starts running way rich. I've tried map, 02, iat, ECM, coolant temp sensors both of them, fpr. This is not a street legal rig so is there a way to keep the computer in closed loop? When it's cold it's the best running 2.9 I've came across. I'm about to megasquirt it so it will run better. I might even turbo it for fun just because I can.

Pull codes, fix it right, you might learn something in the process.

Unhooking the o2 sensor will keep it in open loop.

Pete

 

[dieselboy740]

I forgot you can pull codes on it. Even if I leave the 02 unhooked it still runs like crap once it's warm. I have a code reader I'll pull codes when I get home to Cali. I have like 3 rangers with 2.9s that I have been messing with. This is the first problem that I haven't been able to figure out.